How to enure/cross check the svg file exported from adobe illustrator for laser cutting meets the dimension which it was showing when designed. In simple words how to check 100 mm mentioned size when exported as svg is 100 mm only

Hi! Yes, there is a definite way to check this. Do it in this order:

1. Before exporting: set your units to millimetres (Preferences > Units) and select the artwork. The Transform panel should show exactly W = 100 mm. (If the stroke is part of the finished size, also turn on Preferences > General > Use Preview Bounds, so the stroke width is included in that measurement.)

2. When exporting (File > Export > Export As > SVG): in the SVG Options, untick "Responsive". With Responsive ticked, the width/height are left out of the file and the importing app has to guess the physical size. Also set Decimal Places to 3 so the size is written precisely.

3. Cross-check the exported file: open the exported SVG again in Illustrator (new document, units in mm), Select All, and read the W value in the Transform panel. If it says 100 mm, the file itself is correct. You can also open the SVG in a text editor: the numbers in the <svg> tag / viewBox are in points, and 100 mm = 283.46 pt (divide the number by 2.8346 to get mm).

4. If the file checks out at 100 mm in Illustrator but imports into your laser software at 75 mm, nothing is wrong with the file: that app is reading the SVG at 96 dpi instead of 72 dpi. Set its SVG import resolution to 72 dpi if it offers that setting.

Hope that settles it!